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Evaluation of naturally occurring radioactivity across the State of Kuwait using high-resolution gamma-ray spectrometry

Bajoga, AD, Alazemi, N, Shams, H, Regan, Patrick and Bradley, David (2016) Evaluation of naturally occurring radioactivity across the State of Kuwait using high-resolution gamma-ray spectrometry Radiation Physics and Chemistry, 137. pp. 203-209.

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A study of natural radioactivity from 90 different soil samples from the state of Kuwait has been carried out to ascertain the NORM concentration values across the country. The calculated activity concentrations were determined from: (i) the decays of the 226Ra, 214Pb and 214Bi members of the 4n+2 decay chain headed by 238U and; (ii) the 228Ac, 212Pb and 208Tl members of the 4n chain headed by 232Th. The study also included evaluations for the 235U decay chain with the 186 keV doublet transition used together with the measured 4n+2 activity concentration values to determine the 235U/238U isotopic ratios for each sample. The values for the arithmetic mean activity concentrations for 90 separate locations across Kuwait as determined in the current work were 17.2, 14.1, and 368 Bq/kg, with standard deviations of 5.2, 3.7 and 90 Bq/kg for the 238U, 232Th and 40K activity concentrations respectively. Measured isotope ratios for 235U/238U give an arithmetic mean value for all of the samples of 0.045±0.003, consistent with that expected for natural uranium. These results indicate no evidence for a radiologically significant dispersion of additional depleted uranium across the entire State of Kuwait from the 1991 Gulf War.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Bajoga, AD
Alazemi, N
Shams, H
Date : 10 February 2016
DOI : 10.1016/j.radphyschem.2016.02.013
Copyright Disclaimer : Copyright 2016 Elsevier Ltd. All rights reserved.
Uncontrolled Keywords : NORM Activity concentration Isotopic activity ratio Gamma-ray spectroscopy Depleted uranium Elemental concentration
Depositing User : Melanie Hughes
Date Deposited : 13 Jun 2017 09:23
Last Modified : 16 Jan 2019 18:53

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